You should make wudhu when you go to bed and have intention to get up in the morning. Recite the last verse of Surah Al-Kahaf and sleep having a firm intention to wake up in the morning; you shall wake up timely, in-sha-Allah. When you get up from your sleep, you should not get slackened and do not let any thought to come. Also, recite the kailmah.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband